use std::path::{Path, PathBuf};

pub fn ensured_dir<P: AsRef<Path>>(dir_path: P) -> anyhow::Result<PathBuf> {
    let dir_path = dir_path.as_ref().to_path_buf();
    if !dir_path.exists() {
        std::fs::create_dir_all(&dir_path)?;
    }
    Ok(dir_path)
}

pub fn expand_home<P: AsRef<Path>>(path: P) -> PathBuf {
    PathBuf::from(shellexpand::path::tilde(path.as_ref()))
}

pub fn canonicalize<P: AsRef<Path>>(path: P) -> anyhow::Result<PathBuf> {
    let path = expand_home(path);
    let parent = path
        .parent()
        .ok_or_else(|| anyhow::anyhow!("path <{}> should have parent", path.display()))?;
    let file_name = path
        .file_name()
        .ok_or_else(|| anyhow::anyhow!("path <{}> should have file name", path.display()))?;
    let parent = parent.canonicalize()?;
    Ok(parent.join(file_name))
}

pub fn create_dir_parent<P: AsRef<Path>>(path: P) -> anyhow::Result<()> {
    let path = expand_home(path);
    let parent = path
        .parent()
        .ok_or_else(|| anyhow::anyhow!("path <{}> should have parent", path.display()))?;
    std::fs::create_dir_all(parent)?;
    Ok(())
}

// pub fn trim<P: AsRef<Path>>(path: P) -> anyhow::Result<PathBuf> {
//     let parent = path
//         .as_ref()
//         .parent()
//         .ok_or_else(|| anyhow::anyhow!("path <{}> should have parent", path.as_ref().display()))?;
//     let file_name = path.as_ref().file_name().ok_or_else(|| {
//         anyhow::anyhow!("path <{}> should have file name", path.as_ref().display())
//     })?;
//     let file_name = file_name.to_str().ok_or_else(|| {
//         anyhow::anyhow!(
//             "file name in path <{}> should be valid utf-8",
//             path.as_ref().display()
//         )
//     })?;
//     let file_name = file_name.trim_end_matches('/');
//     let res = parent.join(file_name);
//     Ok(res)
// }